Finding the Fourth Proportional to 5,778.72, 7,972.56 and 3,686.40

Step by Step Solution

1. Step 1: Write the proportion equation
   5,778.72 : 7,972.56 = 3,686.40 : x
2. Step 2: Convert to fraction form
   5,778.72/7,972.56 = 3,686.40/x
3. Step 3: Cross multiply
   5,778.72x = 7,972.56 × 3,686.40
4. Step 4: Simplify right side
   5,778.72x = 29,390,045.18
5. Step 5: Solve for x
   x = 29,390,045.18/5,778.72
6. Step 6: Final answer
   x = 5,085.91